| There exists strong magnetic field and abundant energetic particles in active coronal region, in magnetic field the extremely relativistic electrons will produce synchrotron radiation. During this process electrons will not only lose energy for self-radiation, but also gain energy from induced absorption. On the basis of analyses, the radiation with low frequency by relativistic electrons will form Rayleigh-Jeans spectrum in optically thick medium. Using Fokker-Planck equation, the accelerationof fast electrons by the spectrum will produce the power-law electron energyspectrum. By selecting suitable parameter we get the same spectrum as that Lin et al. obtained in 1982. So we conclude that observed electron energy spectrum about 10 Mev in large flare may be produced by the acceleration of synchrotron radiation.In chapter one, we make a review of particle acceleration theory and the use in solar corona. In chapter two, first we get the spectrum of synchrotron radiation then obtain the electron energy spectrum. In last chapter, we select the typical solar active region parameter to compare our result to the observation and discuss the acceleration mechanism. |
